Yes you can customize our software according to your needs,you can easily change the

color

add domain

logo

title

header

footer

menus

we allow white label as it's front end is open source and back end is based on open source asterisk, except a few back end libraries most of ICTBroadcast code is open source, you can modify it . There are REST APIs , you can use these APIs to sync your contacts with ICTBroadcast.

Addons are modules which will extend / add new features to existing ICTBroadcast installation.
you can fax and voice broadcast without buying any additional addon but for Email,SMS,Appointment,Inbound and Survey support you have to buy additional modules.

No ,only linux / centos 7.x supported. Operating System CentOS 6.x or CentOS 7.x with ssh root access.
Once we install it on centos 7.x server, any one can accss and use it as it's a web aplication so any person can access fron any operative system.